A strange problem - My iMac can see the airport network, however I can't connect to the server and internet. Whenever I try and manually configure my network settings, with IP address, DNS Server etc, and then apply the settings, it seems not to remember them. Thus, after having set up, and applied the settings, then going back into the network settings, everything is blank. Even creating a new new location doesn't save. And also manually typing in the Server address into the address bar of safari doesn't connect (error message: A connection failure has occurred). All of this while it's perfectly happy seeing the network, which is happily working away. I am the only account on the computer and I am registered as an administrator. Another helpful fact might be that I recently reinstalled osX because I was having difficulties before, I've had no connection since then. Has anyone got any ideas on how to rectify the situation before I have to call in some overpriced Mac Doctor?..... please?

Is this on a home network, and if so what type of service do you have for internet? You should be able to set your conection in Network preferances to Airport, Location: automatic, and under the TCP/IP tab configure IPv4: Using DHCP, which will in turn grab an IP address for you. Don't know if this helped but it is kinda how I have mine set up, and mine works just fine.